Ideality of solutions is akin to acuteness for gases, with the important aberration that intermolecular interactions in liquids are able and can not artlessly be alone as they can for ideal gases. Instead we accept that the beggarly backbone of the interactions are the aforementioned amid all the molecules of the solution.
More formally, for a mix of molecules of A and B, the interactions amid clashing neighbors (UAB) and like neighbors UAA and UBB have to be of the aforementioned boilerplate backbone i.e. 2 UAB = UAA + UBB and the longer-range interactions have to be nil (or at atomic indistinguishable). If the atomic armament are the aforementioned amid AA, AB and BB, i.e. UAB = UAA = UBB, again the band-aid is automatically ideal.
If the molecules are about identical chemically, e.g. 1-butanol and 2-butanol, again the band-aid will be about ideal. Since the alternation energies amid A and B are about equal, it follows that there is a actual baby all-embracing activity (enthalpy) change if the substances are mixed. The added antithetical the attributes of A and B, the added acerb the band-aid is accepted to aberrate from ideality.
More formally, for a mix of molecules of A and B, the interactions amid clashing neighbors (UAB) and like neighbors UAA and UBB have to be of the aforementioned boilerplate backbone i.e. 2 UAB = UAA + UBB and the longer-range interactions have to be nil (or at atomic indistinguishable). If the atomic armament are the aforementioned amid AA, AB and BB, i.e. UAB = UAA = UBB, again the band-aid is automatically ideal.
If the molecules are about identical chemically, e.g. 1-butanol and 2-butanol, again the band-aid will be about ideal. Since the alternation energies amid A and B are about equal, it follows that there is a actual baby all-embracing activity (enthalpy) change if the substances are mixed. The added antithetical the attributes of A and B, the added acerb the band-aid is accepted to aberrate from ideality.
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